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Daphnis (moon)
From Wikipedia, the free encyclopedia
 Daphnis appearing as a small dot that causes ripples on the edges of the Keeler Gap in this image from the Cassini probe |
|||||||
|---|---|---|---|---|---|---|---|
| Discovery | |||||||
| Discovered by | Cassini Imaging Science Team | ||||||
| Discovered in | May 6, 2005 | ||||||
| Orbital characteristics [1] | |||||||
| Semimajor axis | 136,504.98±0.02 km | ||||||
| Eccentricity | ≈ 0 | ||||||
| Orbital period | 0.5940800 d | ||||||
| Inclination (to Saturn's equator) |
≈ 0° | ||||||
| Is a satellite of | Saturn | ||||||
| Physical characteristics | |||||||
| Mean diameter | 6 − 8 km | ||||||
| Mass | 5 − 50 ×1013 kg[2] | ||||||
| Mean density | unknown | ||||||
| Surface gravity | unknown | ||||||
| Rotation period | synchronous | ||||||
| Axial tilt | unknown | ||||||
| Albedo | ≈ 0.5 | ||||||
| Surface temp. |
|
||||||
| Atmosphere | none | ||||||
Daphnis (pronounced /ˈdæfnɪs/ daf'-nis, Greek Δαφνίς) is an inner satellite of Saturn. It is also known as Saturn XXXV; its provisional designation was S/2005 S 1.[3][4] Daphnis is about 6 to 8 kilometres in diameter, and orbits the planet in the Keeler Gap within the A ring. It was named in 2006 after Daphnis, a shepherd, pipes player, and pastoral poet in Greek mythology.[5] He was the son of Hermes, brother of Pan, and descendant of the Titans.
It was discovered by the Cassini Imaging Science Team on May 6, 2005.[3] The discovery images were taken by the Cassini probe over 16 min on May 1 from a time-lapse sequence of 0.180 second narrow-angle-camera exposures of the outer edge of the A ring. It was subsequently found in 32 low-phase images taken of the F ring on April 13 (spanning 18 min) and again in two high-resolution (3.54 km/pixel) low-phase images taken on May 2, when its 7 km disk was resolved. It had previously been inferred from gravitational ripples observed on the outer edge of the Keeler gap. This moon seems to make waves inside the ring.
The inclination and eccentricity of Daphnis' orbit are very close to zero, and are not distinguishable from it with present data. Daphnis has an estimated albedo of 50%.
- ^ Spitale, J. N.; et al. (2006). "The orbits of Saturn's small satellites derived from combined historic and Cassini imaging observations". The Astronomical Journal 132: 692.
- ^ Based on diameters and density 0.5 - 2 g/cm³
- ^ a b C.C. Porco, et al., IAUC 8524: S/2005 S 1 2005 May 6 (discovery)
- ^ Martinez, C.; and Dyches, P.; Cassini-Huygens: Cassini Finds New Saturn Moon That Makes Waves May 10, 2005
- ^ IAUC 8730: Saturn XXXV (Daphnis) (naming the moon)
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|
|
|---|---|
| Generally listed in increasing distance from Saturn. Temporary names in italics. | |
| Ring shepherds | (moonlets) · Pan · Daphnis · Atlas · Prometheus · S/2004 S 6? · S/2004 S 4? · S/2004 S 3? · Pandora |
| Co-orbitals | Epimetheus · Janus |
| Inner large (and Trojan) |
|
| Outer large | Rhea · Titan · Hyperion · Iapetus |
| Inuit group | Kiviuq · Ijiraq · Paaliaq · Siarnaq · Tarqeq |
| Norse group |
Phoebe · Skathi · S/2007 S 2 · Skoll · S/2004 S 13 · Greip · Hyrrokkin · Mundilfari · Jarnsaxa · S/2006 S 1 · S/2004 S 17 · Narvi · Bergelmir · Aegir · Suttungr · S/2004 S 12 · Bestla · Farbauti · Hati · S/2004 S 7 · Thrymr · S/2007 S 3 · S/2006 S 3 · Surtur · Kari · Fenrir · Ymir · Loge · Fornjot |
| Gallic group | Albiorix · Bebhionn · Erriapus · Tarvos |
| Rings of Saturn · Cassini-Huygens · Themis · Chiron | |